"What Publicis is doing represents a concern it didn't get the technology right. I think Maurice (Levy) is acknowledging an Achilles' heel when it comes to technology." - Sir Martin Sorrell, the WPP chief executive, on Publicis Groupe's recently announced partnership with Google
"I'm sorry Martin said that. It's really cheap, but probably the result of his lack of understanding of technology. I'm pleased with what we've done, and I'm sorry my friend hasn't understood it." - Maurice Levy, the chief executive of Publicis, hits back.